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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0f2e475263e9813fdc0267e04aca6530efb05897e21996a71f0025de0665391' 
  AND token = 'hgtqlDhY7/ApM3ys7l5jePeJZnX7FYpxwjUlMhTUdWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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