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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bb6ba0b5caa1d50b710c4b704b6cae6fe2f34d962c1e44d66fd4e41a1b17614' 
  AND token = 'rTU7aY45ALTigZlY0mu9aatl41Q4pkxDUVSncudsv1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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