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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45d6672f49c098a316917095508358ad453b1ec0d42ed3697c0b9b0d8a0a5a70' 
  AND token = '/3VRiV83pboUTbtIUDUr75KNIWTnw8K2ModDqIaQErU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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