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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03bb3d382176996eafb54849927263c9688f2e8b7b86fd0e5c6e3a16bb43c619' 
  AND token = 'J6ElffiH4p0c2l3vP23hJxpru2/jHmeBhyiy5mKTjXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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