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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0efa2963bc4b06533c12a2a0cfb2ebbc13077fa3a335a07e8162cca5ed8dc044' 
  AND token = 'rZ0FH/PB8qoad4eNJ9sI0CCDtEq/wWaQ11AF/ya9pJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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