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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '915c5b7d471c20e17722a9a3a262a8c2dc6db1d2c39dcff48d181c30a09d4163' 
  AND token = 'rC1LDCydVJofRQpO28ljv4+Bag9fCkRJlUqZNlTeV+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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