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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e3eb155e0b3c9dbed0ad14b2fcf3b29117e624b1023e7dc2aaba9ca1c08abe9' 
  AND token = 'lw4pD77pux4B0V4NVL7R/Ohh7elaY9zV5zpxW3kiZSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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