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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd319f1c5154aba3976ff11cadb8a19dd5eda3ad8267f50c81d337e9acfc77e6b' 
  AND token = '4eZ1DGgKaxgyUbID7ifz9p3PeCJ1vX6Qlof07IR9aaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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