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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b106f293f5edd27fc8db50b1050898cab3c7afd247f05818503ebc596b65acde' 
  AND token = 'hr92UHxDSqQibjpAwAb5T7PrX1hfbQnvmrrEjcyyMKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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