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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ea6a26df44519bff48d68c80c87f9dadd4ccea2de1e71624b95220d4646646c' 
  AND token = 'RrtxYwDPdWjUtCJ9pdDQRPsc8nc5VDieblphy6yyuyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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