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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f8f9b89967ddd51a692e89e66bde59bf65e5da9b49b7aa5fae61f81152d2902' 
  AND token = 'AfNp4OmhrHNogKVUnclWuzHXO18/Y36a911kG8gTLE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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