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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1820219e7e555e0eebea1d17984dc9d5971599de33d76f6cae7d563eeca020d2' 
  AND token = 'Z+ZWjajURmAS0pcEUtJNtuiY0s1hdZwjilmzdSTebUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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