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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd8145cdc3ce2fd221812ab90f9e01d695c69160f2ad13b46514e1cd12863447' 
  AND token = 'F7wLhfSRhUEhOsOJ2iSxs9iIosEh14IzHN9/4nd4afk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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