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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0fb764311f006b8819c3154cc5465fd243f4b614f19adbfe9aa865a230db6e1' 
  AND token = 'ckInD9N+omnpFhw0Oa2/rZ88TZwEmM23H7VyWDufP+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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