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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b39bf2fede4fb37aded74f0e875099f4feabb7c4fbfd3b4db784994cd989e59' 
  AND token = '5KR4vqAz51lJy3mir8zew4yVyznXsqqMlxC0mskewNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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