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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c02dfe40fd2042e2768c32070dc7688aa23aba1a63e772d7153c29a0b75e95c3' 
  AND token = 'Ymubl8D5LfxZuto1zfiF7SBYG6TeSdtzLbi6de1lJkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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