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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '887fec377d205b246ae46427cdee62d7bf267c9a29f58b66c5d4d3258be505ad' 
  AND token = 'DJkF5fFHXJM8z0mYpYBrnJSdmfstdfNVKfcHDvBUq+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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