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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4de85d8d02dc8d8b11fb4ab14f6fb6e043a8093c3ede2baea9f7f1c32a57d206' 
  AND token = 'IUOiyAEOWhMTMvLC2msawrDH/3bTciktWe3PHoYsn6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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