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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e29db8c5fb58c4bfb5aae5b54bc3a46ed6fa80a1a305b89dede28088aad296d' 
  AND token = 'I5+OIjaHn3SCKNeLmAX+Zbb8Ve7mOkd1/N3o9qLa+o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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