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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f155fd648d608178ac6f92106d9c5a0850c1717ecdc7f95dd322dd457d78e36e' 
  AND token = 'RxA7LSvvBgKaclm5mdInPlM2zziGKjGRDoWAV0adkz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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