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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae774aaf6bb382e28486b9636adf336aae08ef8cc02e137f8ed890f532815b7b' 
  AND token = 'bqbHzQZFFfmWb4H5a0VxcFmyjyO7sVhD+gkHA4EHETM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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