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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1befd7acc50fba83605ee294b1d6588c2b883d06bed046e275aa5675efc38ebe' 
  AND token = 'g4CGxGje5zd8Qqvejk7vY+krrru6pFS/vmu8u+WQuEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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