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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aefde48bbad45f5bd587719dd4f842610864496337c7bcba2ae6a68933341f8' 
  AND token = '+n1dIbLfbPtJHPm6td1keAZ2rDNNb18wggNRwLxSzGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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