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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd433ba30cf7397be0a0a686907da04334d23da1e11764fb327ffd8daf97203c6' 
  AND token = 'LPtv7gR7tJZ0tGCos/P8alVuRe5N/8/5pZr8pmtLk1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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