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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dc4d56b4b3e89031333b0b7a1f0db3e5cd4f691baa91b5e8684e630183fca69' 
  AND token = 'kMdufGQ9UZ4ZYHAelVsHBB/y05vFH/MBIatfK08wh4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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