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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4869a9482d03fe53bdffb73d46702591fa8d605d7bb6e9245007349605da2437' 
  AND token = 'a8+W4yMZdYT9H/40DSQEfK3Otjern97embUSY9mKLt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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