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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a82fa3f070b717ee301076adc0469ded8ee81d9adac57c73d48a906e44ab506' 
  AND token = 'fvrOxhS8eP7+c5X7NOass6jBILiG8j4RrDbfolltMto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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