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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98ecf28b02e083fb650d00ff533d257b380f2d3dc0c03354c066d8817b83e4be' 
  AND token = 'U0SC5+UkQlGOndIzbBWJ6iUmkxPkALwcgFyH5MyEb6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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