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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfe80f03f2408e2fe10ee1f8da15661c16f10f199d99ba256f666d74d94d4d19' 
  AND token = 'yFNdfjyfLQ5GiBxCreGoe2vk0DNi72GtmAaPo0EWUQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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