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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a909b071f68f31903fe7603b607fb769b339f6ac9e3feeca77c0e30f81825c12' 
  AND token = 'REN7exJgJeGMNyoNpF1R6Fuaddtd7+nvmIH2tjAskbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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