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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '409fbfd20e923640337500cdfdc2fb297ea68688dcde402437a4cb45280877be' 
  AND token = 'zrY+7De0H+pqW7H8kjAj2j7NUJohK7jS1HzKmhl3WN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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