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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ceffc02dc9771b896e3872923bf2b1db84006c6cdd9699f6b0779ff8ab28db4' 
  AND token = 'gv923ukEVdnNlEsQ2Iecx9IC178x0Rx8k80cHqttrDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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