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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec5229bb918f730edb7e71597009f823fa5532b492afe6d7b3ac1b27a2fa2f0b' 
  AND token = 'CBLL9jAv9rt891a4gzZQvtmonxWxGsg0mLcGdGFxg2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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