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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0842f588e10c33f40509b3bd445ba79f21c082c55c1f94feb807cbc6fea6f9dd' 
  AND token = 'kTv/ModScM0di+XZA3zUrXM8RnCWHioxwt6OZAyfEFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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