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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca7d826810d4b0b320b445866c8966fc6b7ffba29066e5e5762ac3bfc540e09c' 
  AND token = 'sy9ZShcFsTRSR4DH4gpWJT79jC9DtA9/Fv3AhxxlPfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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