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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0d7b43379860f59485b78d0890cbcbc07401e5fa6be47846b5e14bdc719ca4f' 
  AND token = 'NBTUbWKdlH5YZituLUkidZ66IDXzFcflUoqKHTKpW2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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