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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '659b9866209c2fed836fc6040ad6a65b0711e4889814fe3faa34d16e3ee5404c' 
  AND token = 'S78RpNtEuItxsSopaHfy0xhnIFB5HkJOL/fiJU4O4Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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