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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e277bc3dcdac432269430042f1ff86d454b66aa46b420e0efffc102713c0571e' 
  AND token = 'oaFVE/4pOURFF8WCWKJavXoEkNpHX0cbFeM6k22Ktxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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