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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd8ab2de3538aa357dc3b32c392ee9618cfcd45f0bfc9635cc77f8aa05be537e' 
  AND token = 'ROqQYurjfuDeOQ0zBeoUzHuGQXuCaLTpt5vv0gnAbKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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