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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '414bda88a2d16e14e6288aec4fe20dec0c3a8fbbcaf716c0eb06e3c30a8dad21' 
  AND token = 'RvHs9EjwXwFtaoS4yFzpWkwp0cdiKQhRNA7Db58gvFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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