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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f11518600ac5402beaeef4b5a17c499e80ddb56ea1a1ae0782c63583a7665fa' 
  AND token = '/13bC3Hv6lRxxHNg0RBitF5WEMNW03PTO9n8LaBByqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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