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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ca707ec386e951a3c03e6dacce51030d6d3dcfe6425c091c85bae9a6facdc4b' 
  AND token = 'IunRZdIhx78v54TCUb/BXC6htMwk79xpK1DnU5h+QBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}